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Police in Arizona have accused a Casa Grande mother of stabbing her ex-husband and then force-feeding narcotics to her four children — which killed her 13-year-old daughter — on Christmas day.

According to KNXV, 33-year-old Adam Villa contacted police on Christmas night to say that he had been stabbed by his wife, 35-year-old Connie Villa, and was driving himself to the hospital.

Officers responding to the scene found Connie Villa holding a knife to her chest. She had already suffered multiple stab wounds.

Daughter Aniarael Macias, age 13, was found dead in a bathroom. And investigators were able to determine that three other children also had trace amounts of opiates in their system, according to The Arizona Republic. The surviving children were ages 3, 5 and 8.

Connie Villa was taken into custody and charged with one count of first degree murder and four counts of attempted murder.

At a press conference on Sunday, police said that the mother had forced the children to take “prescription narcotic drugs in an attempt to kill them.”